Preview of “Lab 9 InLab - Titrations”

Preview of “Lab 9 InLab - Titrations” - Lab 9...

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Unformatted text preview: 11/6/12 Lab 9 InLab -‐‑ Titrations Steve Yarush CH102, section 021, Fall 2012 Instructor: Brandon Zoellner WebAssign Lab 9 InLab -­ Titrations (In-­Lab) Current Score : 50 / 50 Due : Tuesday, October 30 2012 05:25 PM EDT The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may not grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed the answer key. Request Extension View Key 1. 35/35 points | Previous Answers NCSUGenChem102LabV1 9.IL.01. Part A: Titration of vinegar HC2H3O2(aq) + OH –(aq) → C2H3O2–(aq) + H2O(l) Complete the following table. (Enter all mass and volume data to the closest 0.01 unit. Enter the concentration of NaOH to 3 significant figures. If you did not do a third trial, enter "0" for each of the Trial 3 column responses.) Data Table A1: Experimental data Trial 1 Trial 2 Trial 3 mass of flask 76.45 g 70.00 g 0 g volume of vinegar 10.00 mL 10.00 mL 0 mL mass of flask + vinegar 86.11 g 79.79 g 0 g mass of vinegar 9.66 g 9.79 0 g concentration of NaOH .496 M initial buret reading 1.00 mL final buret reading 18.39 mL 18.31 volume of titrant added 17.39 mL 17.21 1.10 g mL 0 mL mL 0 mL mL 0 mL Complete the following table. (If you did not do a third trial, enter "0" for each of the Trial 3 column responses, but do not use that value to calculate the averages.) Data Table A2: Calculated results Trial 1 Trial 2 Trial 3 average mmol of NaOH 8.63 8.54 0 8.59 mmol of HC2H3O2 8.63 8.53 0 8.58 .518 .512 0 .515 www.webassign.net/web/Student/Assignment-‐‑Responses/last?dep=4449821 1/2 11/6/12 Lab 9 InLab -‐‑ Titrations mass of HC2H3O2 .518 g molarity of HC2H3O2 in vinegar g .863 M mass percent of HC2H3O2 in vinegar .512 g .853 M 5.36 % 0 g 0 M 5.23 % .515 .858 M 0 % 5.30 % Titrations 2. 15/15 points | Previous Answers NCSUGenChem102LabV1 1.IL.04. Type your name into the answer box. This space will be used by your instructor to record your points for class participation in the lab using the User Participation Rubric. Steve Yarush Score: 15 out of 15 Comment: www.webassign.net/web/Student/Assignment-‐‑Responses/last?dep=4449821 2/2 ...
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